Symptoms
- Grinding or buzzing during the wash cycle
- Loud banging or thumping noise
- High-pitched squeal during draining
- Noise gets worse over time
Likely causes
- CommonObject stuck in the pump or spray armSmall items like glass shards, bottle caps, or labels can get caught and cause grinding.
- PossibleWorn wash pump bearing or motorBearings wear out over years of use and create a grinding or humming sound.
- CommonSpray arm hitting a tall dishAn item loaded too high can strike the rotating spray arm on every rotation.
- CommonLoose silverware basket or rack partLoose components can rattle audibly during the wash.
- PossibleFailing drain pumpA worn drain pump often makes a high-pitched whine specifically during the drain phase.
What to do
- Pause the cycle and check that no tall dishes are blocking the spray arm's rotation path.
- Check the bottom of the tub and filter area for broken glass, bottle caps, or other debris that could be caught in the pump.
- Spin the spray arms by hand to feel for grinding or resistance.
- Check that all racks, the silverware basket, and any rack clips are seated securely and not rattling loose.
- Run the cycle again and listen for exactly when the noise happens (fill, wash, or drain) to narrow down the cause.
- If the noise is a grinding or whining sound from the pump area with no visible obstruction, the pump or motor bearing may be worn and need replacement.
Tools and parts
- Flashlight
Dishwasher wash pumpSearch: “dishwasher wash pump motor replacement”
When to call a pro
If the noise is a consistent grinding or whining with no debris found, have a technician inspect the wash or drain pump for worn bearings.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.